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Lua study notes 9: Multi-file, lua study notes 9 Execute multiple files in a terminal:-l Add a variable defined in file 1 and output the variable in another file. The Code is as follows: --file1.luanum = 100 --file2.luaprint(num) Terminal input (Note: it is not the lua command line ): lua -lfile1 -lfile2 Note: Do not add the file suffix. lua Load files in command line --lib.luafunction norm(x, y) l

SQL Study Notes (21) ---------- add Foreign keys and Study Notes ---------- I have been busy with exams recently! As soon as I saw the exam, I was covered! Completely blank brain, uncontrolled, coupled with abnormal invigilators, let alone how painful it is. Fortunately, after successfully completing the test, I took some time out to learn about MySQL and Oracle and found some problems, which seemed very se

Mongodb Study Notes 01 and mongodb Study NotesMongodb Overview Mongodb is a document-type NoSQL database that stores bson-> json binary. The internal execution engine is a js interpreter that stores documents into a bson structure and converts them to js objects during query. And can be operated through js syntax.Comparison between mongodb and traditional databases Traditional DatabasesIs a structured datab

Linux cloud computing cluster Architecture Study Notes: user management and root User Password Reset, Study Notes root RHEL7User Management Content of this section: Configuration files of users and groups Manage users and groups RHEL7Crack the root password Compared with windows, users and accounts in LINUX serve the same purpose. It is based on the user's control over the accessed resources, but there

[Study Notes] [C Language] sizeof, Study Notes sizeof 1. used to calculate the memory bytes occupied by a variable, a constant, or a data type. 2. sizeof has three forms 1> sizeof (variable \ constant) Sizeof (10); char c = 'a'; sizeof (c ); 2> sizeof variable \ constant Sizeof 10; char c = 'a'; sizeof c; 3> sizeof (data type) Sizeof (float ); Note: it cannot be written as sizeof float; 3. Code 1

[Study Notes] [C Language] data, Study Notes C Language1. What is data? We are always dealing with data, such as weight data, blood pressure data, and stock price data. When we use computers, we will be exposed to a variety of data, including document data, image data, and video data, there are also text data generated during chatting on QQ, and file data downloaded by thunder.2. Data Classification Data st

[Struts2 Study Notes] section 1 simple cognition of struts2 and struts2 Study Notes Address: http://blog.csdn.net/sushengmiyan/article/details/40298287 Official documents: http://struts.apache.org/release/2.3.x/docs/home.html Author: sushengmiyan Certificate ------------------------------------------------------------------------------------------------------------------------------------ What I have to kn

RancherOS Study Notes (1), rancheros Study Notes Today, I just want to briefly understand rancheros and try to install it. This is the official documentation: http://docs.rancher.com/ OS/ This is the official site Github address: https://github.com/rancher/ OS Rancheros has a very strange system management method. All system-level services of the operating system, such as udev and syslog, already exist in t

[Web Development Study Notes] Structs2 OGNL Study NotesPart 1: Code // Front-end //web.xml //ognl.xml // Class package // ognl. javapackage com. struts2.ognl; import java. util. arrayList; import java. util. hashMap; import java. util. hashSet; import java. util. list; import java. util. map; import java. util. set; import com. opensymphony. xwork2.ActionSupport; public class OgnlAction extends ActionSuppo

Liblas Study Notes 2-build grid indexes and liblas Study Notes The main code file is index. hpp index. cpp. Index. hpp defines several macros // Maximum memory limit. The default value is 10 MB. # Define LIBLAS_INDEX_MAXMEMDEFAULT 10000000 // 10 megs default // Minimum Memory, 1 MB by default # Define LIBLAS_INDEX_MINMEMDEFAULT 1000000 // 1 meg at least has to be allowed // Maximum number of grids, up to 0.

MySQL Study Notes _ 8_ SQL BASIC Language review, Study Notes _ 8_ SQL SQL language basic review I. Overview SQL statement comments 1) All contents starting with "#" until the end of the line are comments 2) All content starting with "--" (-- and then a space) until the end of the line is annotated. 3) All content ending with "/*" and ending with "*/" is annotated and can be used to comment multiple lines.

Mysql Study Notes 4 (view), mysql Study Notes ViewView Operations on views can simplify queries and improve security. View: Essentially, a virtual table is similar to a real table and contains a series of columns and row data with names. However, a view does not exist in the form of storing data values in the database. The row and column data are derived from the basic tables referenced by the qu

Mysql Study Notes 1, mysql Study NotesDatabase Operations 1. Create a database Create database databasename Return Query OK Error 1007 is returned if an Error occurs. 2. view all databases Show databases Note: It is databases, plural 3. Select a database Use databasename The returned result is Database changed. It is useful when using reverse CT. Error

[HTML5 learning] HTML5 Study Notes (2) and html5 Study Notes Next (6): HTML5 style, link and table ①: HTML style: 1. label: 3. inline style sheet:

Python Study Notes 2: python Study Notes Chapter 4 for and while Loops 1. for is faster than while. The author of the python learning manual has been restarting to emphasize this. 2. A lot of for usage A. for x in list:, similar to foreach in C #, but the modification to x cannot change the original value unless x is a reference to the object (if you want to modify the original value, you can only use B for

Sqlite Study Notes 1: Compile the database and sqlite Study Notes First, I am using a Linux environment. 1. Download source code Download from the official website: click here Second compilation 1. Decompress After the download is complete, it is generally in the "Download" directory of the current user, first cd to the download directory, and then create a file to put the decompressed file: mkdir sqlite

[Struts2 Study Notes (11)] perform input validation on all the methods of action based on the input validation and XML configuration method of action. struts2 Study Notes In struts2, we can verify all the methods of the action or the specified method of the action. Two input verification methods are provided for struts2:1. Use manual coding for implementation.2. Implementation Based on XML configuration.1

[Struts2 Study Notes (10)] custom interceptor management permission access, struts2 Study Notes (1) The functions of the interceptor are not directly mentioned in the Code: To customize the Interceptor, you must implement the com. opensymphony. xwork2.interceptor. Interceptor interface: The following is a custom Interceptor: Package cn. lc. interceptor; import com. opensymphony. xwork2.ActionContext; impor

Java Study Notes 12, java Study Notes The Object class is the parent class of all classes, arrays, and enumeration classes. It is the root class of the class hierarchy. Each class uses an Object as a superclass. All objects (including Array. The Object class implements the following methods: Let's take a look at the getClass () method in the source code: public final native Class The above Class For

Java Study Notes 10, java Study Notes When a program creates objects, arrays, and other reference objects, the system allocates a memory area for them in the heap memory, and the objects are stored in the memory area, When the object we create is no longer referenced, the memory will become garbage, and finally wait for the garbage collection mechanism to be recycled. the Java garbage collection Machine S